The web is not software, but a global, dynamically interactive, cross-platform distributed graphical information system based on hypertext and HTTP; it is a network service built on the Internet. It provides a graphical, easy-to-access and intuitive interface for viewers to find and browse information on the Internet. The documents and hyperlinks organize the information nodes on the Internet into an interrelated network structure.
The operating environment of this tutorial: Windows 7 system, Dell G3 computer.
The web is not software.
web (World Wide Web) is a global wide area network, also known as the World Wide Web. It is a global, dynamically interactive, cross-platform distributed graphical information based on hypertext and HTTP. system. It is a network service built on the Internet. It provides a graphical, easy-to-access and intuitive interface for viewers to find and browse information on the Internet. The documents and hyperlinks organize the information nodes on the Internet into an interactive system. Associative network structure.
Expression form
1.Hyper text
Hypertext is a user interface method used to display text and text Related content. Currently, hypertext generally exists in the form of electronic documents, in which text contains hypertext links that can be linked to other fields or documents, allowing direct switching from the current reading position to the text pointed to by the hypertext link.
There are many hypertext formats, the most commonly used ones are Hyper Text Markup Language (HTML) and Rich Text Format (RTF). The links on the web pages we browse every day are hypertext.
Hypertext link is a global information structure that links different parts of a document through keywords so that information can be searched interactively.
2. Hypermedia
Hypermedia is the abbreviation of super media. It is a combination of hypertext and multimedia in an information browsing environment. Not only can users jump from one text to another, but they can activate a sound, display a graphic, and even play an animation.
The Internet uses hypertext and hypermedia information organization methods to extend information links to the entire Internet. The Web is a hypertext information system, and one of the main concepts of the Web is hypertext links. It makes the text no longer fixed and linear like a book, but can jump from one position to another and get more information from it, and can also go to other topics. If you want to know the content of a certain topic, just click on the topic and you can jump to the document containing this topic. It's this multi-connectivity that calls it the Web.
3. Hypertext Transfer Protocol (HTTP, HyperText Transfer Protocol) is the most widely used network protocol on the Internet.
Features
Graphic
One of the important reasons why Web is very popular is that It has the capability to display colorful graphics and text simultaneously on one page. Before the Web, information on the Internet was only in text form. The Web can provide features that integrate graphics, audio, and video information.
Independent of platform
No matter what the user's system platform is, you can access the WWW through the Internet. Browsing the WWW has no restrictions on the system platform. We can access WWW from Windows platform, UNIX platform, Macintosh and other platforms. Access to the WWW is achieved through a software called a browser. Such as Mozilla's Firefox, Google's Chrome, Microsoft's Internet Explorer, etc.
Distributed
A large amount of graphics, audio and video information will occupy a considerable amount of disk space, and we cannot even predict the amount of information . For the Web, it is not necessary to put all the information together. The information can be placed on different sites. You only need to indicate this site in the browser. Physically, information on a site is not necessarily logically integrated. From the user's perspective, the information is integrated.
Dynamic
Since the information of each Web site contains the information of the site itself, the information provider can often perform modifications to the information on the site. renew. Such as the development status of a certain agreement, the company's advertising, etc. Generally, all information sites try their best to ensure the timeliness of information. Therefore, the information on the Web site is dynamic and frequently updated, which is guaranteed by the information provider.
Interactive
The interactivity of the Web is first reflected in its hyperlinks. The user's browsing order and the sites they visit are completely determined by him. up to you. In addition, dynamic information can be obtained from the server through FORM. Users can submit requests to the server by filling in the FORM, and the server can return corresponding information according to the user's request.
Web front-end and web back-end
What is web front-end?
The web front-end, also known as the "client", is about the visual aspects of the website that users can see and experience, that is, everything the user sees and displayed by the web browser, involving the user Everything to see, touch and experience. Such as graphical user interface (GUI) and command line, including design, navigation menu, text, colorful images, videos, gorgeous buttons, etc.
Web front-end development needs to be built using technologies such as Hypertext Markup Language (HTML), HTML5 (the latest version of HTML), JavaScript, and Cascading Style Sheets (CSS, CSS3).
Web front-end developers design and build user experience elements on a web page or application, including buttons, menus, pages, links, graphics, etc.
What is a web backend?
The web backend, also known as the "server side", is everything that users cannot view and interact with in the browser, such as databases and servers. Basically, everything that happens behind the scenes boils down to web backend development, which is the enabler of the web frontend experience.
The web backend is responsible for storing and organizing data and ensuring that everything on the web frontend works properly. The backend communicates with the frontend, sending and receiving information to be displayed as a web page.
The Web backend facilitates communication between the presentation layer and the business layer and plays a vital role in Web development; Web backend development requires the use of C/C/C#, Java, Ruby, Python, PHP, .Net and other languages.
People who usually work on the backend are called programmers or developers. Backend developers need to handle everything that doesn't involve generating a user interface, such as writing APIs, creating libraries, or adding utilities to everything a web designer creates.
The role of a back-end developer is highly collaborative compared to a web front-end designer. In a nutshell, backend web development is the combination of development and maintenance of the core functional logic of a software application, with backend developers writing the code to make sure everything works properly on the frontend.
Compared with Web front-end designers, back-end developers tend to spend more time calculating logic and implementing algorithms to ensure that the website runs properly; the Web back-end is the brain of a website.
(Learning video sharing:Getting started with web front-end)
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